package com.huaao.micropolice.root.security;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.shiro.session.SessionException;
import org.apache.shiro.subject.Subject;

public class LogoutFilter extends org.apache.shiro.web.filter.authc.LogoutFilter{
	
	@Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        //在这里执行退出系统前需要清空的数据
	 Subject subject = getSubject(request, response);

     String redirectUrl = getRedirectUrl(request, response, subject);
     try {
          subject.logout();
     } catch (SessionException ise) {
    	 ise.printStackTrace();
     }

     issueRedirect(request, response, redirectUrl);
        //返回false表示不执行后续的过滤器，直接返回跳转到登录页面
        return false;
   	}
}
